Concrete step.



J. .H. T. KIRK & L. J. LAWSON.

CONCRETE STEP. APPLICATION FILLED MAY 1, 1912.

1,071,239. Patented Aug. 26, 1913.

r; f l g L J1:

COLUMBIA PLANOGRAPII C0., WASHINGTON, n. c,

UNITED snares rn'rnn'r oFFion JAKOB H. T. KIRK AND LAURITS J LAWSON, OFWOBURN, MASSACHUSETTS.

CONCRETE STEP.

To all whom it may concern:

Be it known that we, J AKOB H. T. K111i: and LAURITS J. LAWSON,citizens, of the United States, residing in VVoburn, county ofMiddlesex, and State of Massachusetts, have invented an Improvement inConcrete Steps, of which the following description, in connection withthe accompanying drawings, is a specification, like letters on thedrawings representing like parts.

This invention relates to a concrete step and has for its object toprovide a concrete step, which is light, inexpensive, durable andportable, whereby the step can be made as a stock article andtransported to the job ready to be laid, without the necessity ofskilled labor and without the use of the ordinary forms.

The invention further has for its object to provide a concrete stephaving a non-slipping tread surface, whereby serious accidents may beavoided in bad weather.

These and other features of this invention will be pointed out in theclaim at the end of this specification.

Figure 1 is a side elevation of a flight of concrete steps embodyingthis invention. Fig. 2, a plan of two of the steps shown in Fig. 1, andFig. 3, a detail to be referred to.

Referring to the drawing, (1 represents a portable concrete stepembodying this invention, and comprising a body portion having an oblongtread surface I), a riser 0 at right angles to said tread surface, aninclined rear surface d and substantially oblong side arms 6 extendedrearwardly beyond the rear edge of the tread surface 72. The inclinedrear surface cl extends downwardly from the rear edge of the treadsurface toward but not to the bottom of the riser 0, so as to leave abottom surface 10 of substantial width. The tread surface I) may beprovided with one or more antislipping devices 12, and in the presentinstance a single device is shown, which may be a piece of wood ofsubstantial thickness, which is laid in the concrete while the latter isin plastic condition, with its upper surface flush or substantiallyflush with the-concrete portion of the tread surface.

The side arms 6 are made of sufficient length to afford a firm bearingfor a superimposed step, which is laid with the rear edge of its bottomsurface 10 flush with the rear edge of the tread surface I) of the nextlower step, so that the inclined rear walls d Specification of LettersPatent.

Application filed May 1, 1912.

Patented Aug. 26,1913.

Serial No. 694,592.

of a plurality of steps are in substantially the same inclined plane andform a practically continuous rear wall for the series or flight ofsteps. The bottom surface 10 is made of sufficient width to extend overthe tread surface I) of the next lower step, so as to have a portion ofthe lower step of material thickness support the upper step and yetleave a tread surface of ample or desired width. The side arms 6 of thesuperimposed steps may be supported upon filler blocks 15 ofsubstantially the same thickness as said arms and of such length as willenable them to be conveniently handled and as required to close thespace between the steps and the piazza or wall of a building.

In practice, the individual steps are designed to be made in the shop orfactory in suitable molds, and are transported to the house or building,where they can be set up in a substantially short time by unskilledlabor and in a minimum time, as the necessity of building forms at thejob and the presence of skilled labor in erecting the forms and makingthe steps on the job are avoided, thereby materially diminishing thecost of steps of this character. The rearwardly extended arms of theindividual. steps afford the desired or necessary bearing or supportingsurface for the step resting upon them, which permits the body portionof the step to be made light so as to enable the step to be readilyhandled and transported to the job while materially reducing the cost ofconcrete steps.

We have herein shown one construction of portable step embodying thisinvention, but it is not desired to limit the invention to theparticular construction shown. If desired, the bearing arms 6 of thesteps may be provided with iron pins 17, which project above their uppersurfaces and enter sockets 18 in the under surface of the arms a of thestep resting on the lower step. Furthermore, the body portion of thestep may be provided with one or more holes or sockets 19 extend ed fromthe inclined surface at to still further lighten the step. When theflight of steps is composed of many steps, the filling blocks 15 areemployed, but in cases where only two or three steps are used, the sidearms a may be made long enough to extend to the piazza or wall of thebuilding.

Claim.

A portable one-piece concrete step comprising a body portion having atread sur-' face, a user, an inclined rear surface eX- tended downwardlyfrom the' rear edge of names to this specificatidn in the presence ofthe tread surface toward but not to the lower edge of the riser to forma bottonr surl face of substantial Width, and side arms eX- tendedrearWardly beyond the upper edge of said rear surface and having theirouter surfaces substantially rectangular in shape 10 to form a part ofside Walls of the stairs when the latter are eoniposed of a series ofsaid steps substantially as described.

In testimony whereof, Wehave signed our two-subscribing Witnesses.

JAKOB H. T. KIRK. LAURITS J. LAWVSON. Witnesses:

JAS: Hl CHURCHILL, J. MURPHY.

Copies of this patent may be obliai iie'd for'nve cents each, byaddressing the Commissioner of Patents, Washington, If. (1.

